You can probably find some at the bird market.
Just for information, you have to know that parrots can live very long (the grey ones from Africa can live a hundred years !), and it's a LOT of work. They are also sensitive to temperature changes, and can easily die of a draught.
We had one for 15 years and had to give him to a zoo (we were still living in France), as he was getting depressed of being alone. He is still living there with 3 others and is much happier !